WNMA080412-RK7 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of coated carbide performance, precise Trigon 80° geometry and reliable RK7 chip control for productive cast‑iron turning; order directly via Metav Werkzeuge or consult our specialists for application support.

WNMA080412-RK7 WKK20S Trigon 80° indexable turning insert for cast iron – Walter Tools

WNMA080412-RK7 WKK20S is a coated carbide turning insert designed for productive machining of cast iron with RK7 chip control and Tiger‑tec Silver performance.

• Coated carbide Tiger‑tec Silver
• Optimised for cast iron (ISO K)
• Trigon 80° geometry, 1.2 mm corner
• RK7 chipbreaker for short chips

High productivity on abrasive cast‑iron applications

The Tiger‑tec Silver grade WKK20S delivers a robust coated carbide substrate optimised for the abrasive wear typical of cast iron (ISO group K). Thanks to the RK7 chipbreaker, chip formation is consistently short and controllable, reducing interruptions and tool‑post cleaning time. This results in improved cycle times and more predictable tool life compared with uncoated grades. For workshops seeking efficient, repeatable turning operations, the blend of coating technology and chip control provides a measurable productivity advantage.

Geometry and edge specification that support reliable turning

The trigon 80° shape with a 1.2 mm corner radius and 0° negative rake gives a sturdy cutting edge and stable engagement in interrupted or heavy cuts. The insert’s negative relief increases edge strength and resistance to chipping under tough cutting conditions, while the moderate corner radius balances robustness with acceptable surface finish. This geometry is particularly suitable when roughing cast iron components where consistent tool life and low risk of fracturing the insert are priorities.

Practical benefits for workshop integration and process stability

With a standard tolerance class M and execution A, the insert fits common turning toolholders for trigon inserts, simplifying tool inventory and changeover. The coated carbide composition of the WKK20S grade reduces flank wear and maintains dimensional stability over longer runs, lowering the frequency of tool changes and inspecting downtime. As a result, component throughput and process reliability benefit directly, supporting leaner production schedules and predictable maintenance planning.

Applications and material suitability explained

Designed specifically for cast iron machining, this insert addresses the typical short, brittle chips and abrasive interaction of grey and nodular cast irons. The WKK20S coating technology improves resistance to the mechanical and thermal stresses encountered in these materials, meaning fewer rejects and steadier surface quality. While targeted at cast iron, the insert’s robust edge and chip control may also be considered for similar, abrasive cast components where short‑chip behaviour is desired.

For reliable, application‑specific advice on Walter Tools turning inserts and to request cutting data or test recommendations, contact Metav Werkzeuge for tailored support and availability information.

Technical data

• SKU: WNMA080412-RK7-WKK20S-WALTER
• Designation: WNMA080412-RK7 WKK20S
• Product type: Drehwendeschneidplatte / indexable turning insert
• Brand: Walter Tools

Core dimensions

• Corner radius: 1.2 mm
• Plate size: 08
• Thickness: 04
• Plate form: Trigon 80°
• Relief angle: 0° (negative)
• Tolerance class: M

Materials and features

• Grade / coating: WKK20S (Tiger‑tec Silver)
• Substrate code: K (suitable for cast iron)
• Chipbreaker: RK7
• Series: Tiger‑tec Silver
• Execution: A
• Application: Cast iron (ISO group K)

FAQ

What materials is this insert intended for?
This WNMA080412-RK7 WKK20S insert from Walter Tools is designed primarily for machining cast iron (ISO group K), with the WKK20S coating optimised for abrasive, short‑chipping cast materials.

How does the RK7 chipbreaker benefit production?
The RK7 chipbreaker on the WNMA080412-RK7 WKK20S promotes short, controllable chips, reducing interruptions and improving process stability during cast‑iron turning operations.

Which geometry makes this insert suitable for heavy cuts?
The Trigon 80° geometry combined with a 0° negative rake and 1.2 mm corner radius gives a strong cutting edge on the Walter Tools insert, making it well suited to interrupted and heavy cutting conditions.

Is this insert compatible with standard trigon toolholders?
Yes; the WNMA080412-RK7 WKK20S is a trigon 80° indexable insert with execution A and tolerance class M, compatible with common toolholders for trigon inserts.

What advantage does the Tiger‑tec Silver technology provide?
Tiger‑tec Silver coating on the WKK20S grade enhances wear resistance and thermal stability, extending tool life and maintaining surface quality on abrasive cast‑iron components.

Manufacturer/Responsible: Walter Deutschland GmbH; Derendinger Straße 53; 72072 Tübingen; Germany

Die Walter AG (Markenauftritt: Walter Tools) mit Hauptsitz in Tübingen gehört zu den weltweit führenden Herstellern von Präzisionswerkzeugen für die Metallbearbeitung und ist Teil des schwedischen Sandvik‑Konzerns. Geschützte Markenzeichen und Warenbezeichnungen liegen im Recht ihrer jeweiligen Eigentümer. Markennamen und geschützte Warenzeichen werden ausschließlich zu Erklärungszwecken genannt. Es besteht keinerlei Verbindung zwischen unserem Unternehmen und den genannten Marken. Es handelt sich bei dem angebotenen Artikel um originale fabrikneue Waren des Herstellers.